Grinding-machine.



S. MACKAY. GRINDING MACHINE. APPLICATION FILED JULY 28, 1910.

1,052,605. Patented Feb. 11, 1913.

I 2 SHEETS-SBEET 1.

"LLM

a @FFECW of which tile following is a speci- TlliS invention relates to the positioning ing cutter in the grinding machine which it is re be sharpened, and parsicw "1 to e periph ral teeth pcsitic-n indimr for the same.

in ilie patent to Rivett l lo. 690999, the writer 'lmn'h is peripherally gaged by e fixed step. In my present invention 1 have ,"Wglli m overcome certain practical difiicuiiies attendant upon the use of such a sum ll pa l, while preserving and increasllli essential arlraniages which are seliy this manner of gaging.

"ll'ic rearward relief of the outside face mi the miller leelh fnrn'ls an incline of comparatively slight eccentricity -t the axis of rmai'iun of the cutter, and yet it is sufiicient to malcrially decrease the eiiective length of lie reel. upon av very slight grinding. In. W101- l0 accurately a tooth peripherally it is. therefore, necessary that the ceniai-iing moml'irr be capable of accurately determining the proper radial distance desired ii; imler that the ground face of the (warm when sharpened shall lie exaclly llii plane suu' hi". (3n avcmml of the (cumparaliwly sli L ececn'tricity of he rearivzml lent l1 relief a fixed slop is apt to on (he incline oi illie outer euti'er edge permilling a Yai'iaiion in llzc zuljusl'mcm, of

ilH! (Miler.

in my present inwnlien i have devised a muvallle imliraior which is incapable of jamming and which provides fur the utmost in order, nun-emery,

nicely of adjuslmcnl.

in secure lllQ "full benefit-0f such a gaging as has been Hli {(fHlTl?Ll, itis necessary lliai llie: cuiier lmlill be advanced in the grindin;- (li .411; a li'iH radial line. It will be clear 511)!!! a (UilSidQl'iltlU'fl oii' sncll a siruclure us that oi iiivcll that a slight variation in line griml'mgrinder will be so accentuated at the point ml the Luelll as lo oilset illal'. ilvlii-aey cl adjustment which is sought in llze periplu-ral gaging.

My im'enliuu, lllm'rl urm cunsisls further in illv provlsi'wfJiifiieaus fur s0 manipulatiii, ilia igc Apgslieetion filed July :35}, mm. izerial 37453 55.

ing the work slid the abrasive Wheel that the cut will be accomplished on a true radius which, reg ether with the peripheral gaging, assures the uniiermity of tooth length which is sought.

The construction andl operation of my device will lee more fully described in the specificetien which follows. In that specificaaion, and in the drawings which form a part; elc' it, I have showm as illustrative of my device en embecliment which I find; satisfactory in practical use.

Threughout specificebn and drawings ii is reference numerals are empleyed to indicate corresponding parts and in the drawinge- :-l igure l is a View of a grinding machm-e equipped with my invention, Fig. 2 is a plan View partiy in section, arid Fig. 3 is I a detail showing the relative positioning of tooth grining disk and gage arm.

' The machine pedestal 11s providedwith a lateral bracket 2 on which there is a bed 3 supporting a slide ei'centrolled by the milled knob 55.

' 6 is a cross slide, also controlled by a knob 7, and on this ls-supported 1n suitable bear- 8 spindle 9 upon the end of which is moune-rl s31 abraslve Wheel 10. The Wheel 10 is covered by a hood 11 which is open on one side anii adjacent to this opening is a work supperling slide 12 movably mount- 0d en a bracket 1.3 and controlled by a milled knob 15 a plaie adjustable on the Sllx'lfi 12 by a set serewilli 'v-slzich passes lln'eugli a slot (:11 the plate. Near the end of the plate a screw siml l? ripen which is centered a cutter, as inilivalerl 2i I; Just in advance 0'! fire miller mailer Bind V1? is pivetally umunlml a gaging lever 18 whicl'l, a"; il's for ivar-zl end is formed with a toot-l1 engaging point 18 and at its rear-W rd end 18 engages llie aeliialingg red 19 0 a swing multiplying imliraier 2%. Fewer is appiierl ie l'he machine through mlley 31 fixed. (a1 a disk spindle 3* The operation of my device is f0lluws: it is supposed shat tire emery Wheei 10 has been properly trawl. 0? on its front face and is in conrlil'ien to accuralrly .griml the fame of a lenili. A suitable plate 15 is selected which has a stud 17 of the right diameter to fit the cutter to be sharpened and with the cutter clamped on the stud the plate 15 is se adjusted that il teeth of the cutter, when in contact with the gaged lever 18, will move the lever slightly away from a stop pin 18 which is set in the forward end of the slide. The plate 15 is then clamped through the thumb screw 16. The emery wheel 10 is then adjusted by the milled knob 7 so that it will come to the bottom of the tooth w of the cutter X when the slide 12 is moved forward to the limit of its motion. With the emeryqir'heel 10 at rest the face of the tooth w is brought into contact with the wheel and the cutter is clamped upon the plate 15 by the screw 17. It is preferable that the indicator 20 be adjustable, so to bring the dial until the pointer reads on'zero. The screw is then loosened slightly to release the cutter X on the plate aid with the slide 13 drawn back the cutter is rotated to the right until the indicator pointer shows a movement of from one to two thpusandths of an inch which is usually the amount of grinding desired. The cutter is then clamped by taking the screw 17 and the indicator dial is brought again to Zero. With the emery wheel drawn back by turning the knob 5 so that it will clear the cutter tooth the knob 14 is turned to move the slide 13 back and forth past the face of the emery wheel and the emery wheel is itself advanced by successive slight turns on the knob 5 until the proper amount, that is, one or two thousandths, has been removed from the face of the tooth. The slide 13 is then drawn back and the cutter loosened and turned until the indicator reads on zero with the end 18 of the lever 18 in contact with the next tooth which is then ground in the same manner as that just described. In this way it will be seen that each tooth is ground with absolute accuracy on substantially a radial line and each tooth will have an absolute uniform length.

Various modifications may obviously be made in the structure and operation of my said wheel longitudinally and transversely,

a work support mounted for transverse movement relative thereto, means for adjustably centering a toothed cutter on said support and means for gaging on the outer face of a tooth the relative ad ustment of the face of the tooth to the abrasive wheel.

2. In a grinding machine for milling cutters, an abrasive wheel, means for moving said wheel longitudinally and laterally, a work-support laterally movable with reference to said wheel, means for adjustably centering a cutter on said support and a pivoted indicator lever having one end adapted to engage the outside face of the cutter teeth and an indicator on the opposite end of said lever.

3. Ina grinding machine for milling cutters, a frame, a longitudinal slide thereon, a transverse slide on said longitudinal slide, a longitudinal spindle on said transverse slide, an abrasive wheel on said spindle, a; work-support on said frame and movably mounted with reference to said abrasive wheel, means for adjustably centering a cut ter on said work support and a pivoted indicator lever on said slide and having one end adapted to engage the outside face of the cutter teeth and an indicator carried by said slide-and operatively associated with the opposite end of said level.

In testimony whereof I afiix my,signature in presence of two witnesses.

SIMON MACKAY.

I/Vitn esses JOHN IV: BOYNTON, C. STANLEY NEWTON. 

